Current limiting fuse with actuable external means

Abstract

A current limiting fuse with a fuse element disposed over relatively movable portions of a mandrel including movement means for moving the mandrel which means includes an actuating wire having an end portion extending out of the fuse casing which end portion is connected in parallel in an otherwise closed circuit with electrical leads extending to the fuse element.

What is claimed is: 
     
       1. A transformer-fuse system, comprising: (a) a transformer and a fuse connected in a series circuit;   (b) the fuse having a tubular electrically insulating casing;   (c) a terminal at each end of the casing and each terminal being connected in the series circuit;   (d) a mandrel within the casing having one portion movable relative to another portion;   (e) a fuse element disposed on and between the two mandrel portions and the fuse element being in electrical continuity with the spaced terminals to effect electrical continuity until the fuse element opens;   (f) moving means for moving said one portion;   (g) overload means in the series circuit between the fuse and the transformer; and   (h) an actuating wire connected at one end to the moving means and extending from the interior of the casing to the transformer and in a circuit parallel to the circuit that includes the overload means, whereby when one of the fuse element and overload means opens a current is conducted through the actuating wire to operate the moving means to rupture the fuse element in multiple locations.   
     
     
       2. The system of claim 1 in which a load current flow moves between the fuse to the transformer through the overload device. 
     
     
       3. The system of claim 2 in which the casing comprises ferrules, one ferrule at each end of the casing, and the actuating wire extending through one ferrule and insulated therefrom. 
     
     
       4. The system of claim 3 in which each ferrule comprises one spaced terminal. 
     
     
       5. The system of claim 1 in which when the fuse element opens the current is conducted through the actuating wire. 
     
     
       6. The transformer-fuse system of claim 1 in which the fuse element is fixedly attached to the mandrel.